Overview

With an objective to save and protect the resource, we have introduced stormwater infiltration drains with German technology that will prevent stagnant water and store the excess water. Our team assists industries in implementing well-planned stormwater infiltration drain that conserves water and prevents public resources from getting polluted. Protect water resources around you and ensure they remain clean with our latest and modern water management products.

Innovative Low Impact Development through SuDs for Storm Water Management and Recharge of Groundwater Aquifer

Storm water drains / Micro drains are the primary structural elements in planning and construction of Integrated urban flood management projects in Indian cities especially on the extended areas of metro cities which are reported/ prone for flood inundation induced by climate change.

The solutions designed are mostly construction of concrete based hard solutions which are causing environmental/ ecological disturbance and reduce groundwater recharge (most of the Indian cities dependent on groundwater). Hence, design of SWD systems should inherit green / Sustainable Urban Development Solutions (SuDs) and based on water sensitive urban SWD design.

In the recent times, the usage of concrete based solution is replaced with green solutions worldwide through the concepts of Sustainable Urban Development Solutions (SuDs).

This system was designed considering the 5 core requirements:

Conserve natural areas wherever possible avoiding concrete-based storm water drains,

Minimize the development impact on hydrology.

Source control of runoff water and not letting the rainfall runoff water leave the site.

Concept of integrated management practices (IMPs) through which rainfall will infiltrate, store and discharge the runoff into local waterbody/pond.

Preventing pollution and easy maintenance.

An innovative solution “Integrated Storm Water Infiltration Drain and Tank system” by the use of German based Graf “reused” poly propylene materials has increasingly used to replace the conventional concrete based storm water drains.

This method of Storm Water Infiltration Drains and tank system has inbuilt rainwater harvesting arrangement. This method will increase groundwater recharge and reduce urban flooding at 15 - 20% less cost with increased design life. This will not allow sewage and act as a filter layer.

A tunnel structure is being fixed throughout this drain to carry the rainwater.

When it rains, excess runoff water will flow through several filter medias in the drain before reaching the tunnel. Initially, a horizontal structure is fixed. It will have holes to facilitate a free flow of water. Below the structure, a layer of small pebbles are placed. After this, a fabric cloth is fixed, to remove dirt and sand.”

“Following this, two layers – one each of big and small pebbles are placed to facilitate further filtration. After passing through all these layers, pure water will flow into the tunnel, that will take the water to the tank. Below, the tunnel, a layer of fabric cloth for protection was placed.”

The depth of the drain is steadily increased by 1 mm after every 30 meters from the starting point to create a gradient (slope) for the faster movement of the water.

The constructed infiltration tunnel drains cum rainwater harvesting structure will facilitate the flow of excess runoff water from the local urban catchment / all the streets to the Chitrakulam tank, whenever it rains.

Chennai Corporation initiated this project a pilot study in order to evaluate the efficiency and efficacy of this Storm Water Infiltration tunnel type drain which offers multi fold increase in the infiltration of runoff water and drain into Chitrakulam. This project has the inbuilt concept of Low Impact Development (LID) approach. This onsite development approach on the stormwater management is rapidly becoming the innovative Sustainable Urban Development Solution (SuDs) required design approach for managing urban runoff especially in coastal cities of developed nations.

The basic principle is to use nature as a model and manage rainfall at the source. This is accomplished through sequenced implementation of runoff prevention strategies, runoff mitigation strategies, and finally, treatment controls to remove pollutants. The German technology-based system implemented in the Chitrakulam areas is having the reused polymer-based infiltration storm water tunnel sandwiched between filter layers including the use of geotextile based filter. This will prevent the entry of silt, debris and other major pollutants carried in the runoff generated from the roads and from the built-up urban areas. Further merits of installing this system is presented below:

Flexible in geometry and Shortest possible installation time

Convenient maintainable procedure and Low dead weight and small dimensions

High traffic load handling capacity of 60Ton

Excellent ROI as design life is above 50 years

CCTV inspection possible even in a filled state

Modular construction blocks-L800xW800xH360mm

Flat installation depths possible along the roads.

Fully inspectable, thanks to the integrated tunnel.

Surface is delivered back for use immediately after installation.

Underground infrastructure is easily accommodated

High storage volume -up to 96% of occupied volume.

Backfilling and loading possible right after the installation.